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Have experienced slow leaks on tyres.
New 2012 750i X. Delivered 8/30/12
Thought about putting a can of 'fix a flat' in the leaking tyre could cure this.
Any thoughts on this, is this covered under tyre waranty from tyre manufacturers?
Did not buy "Tyre Warranty" with the car.
Your help appreciated.

Agree. Fix-A-Flat and like products will damage the TPMS. Is this happening on more than 1 of the tires? Could be that the tire is defective or unsealed from the wheel. My advice would be to first have it checked at a tire shop. Hopefully, nothing is wrong with the wheel and/or that you won't have to replace any of the tires. Hate to say, but occurrences like this are one of the reasons I have always just gone ahead and purchased the hazard insurance.

The tyres are "DUNLOP"
Had multitude of troubles some years back with that brand on a 1998 Bentley Azure.
They replaced all five on thhat car, with no additinal 'warranty' having been purchased.
Will contact them for any 'elp' theywill provide.